"We have seen reports claiming a United States casualty and can confirm a U.S. service member was involved in this incident", the release said. "We will provide more information as soon as it becomes available".

A Ukrainian Sukhoi SU-27B went down in the Khmelnytskyi region, killing both the pilot and co-pilot, the Ukrainian military's general staff announced on Tuesday.

Details of the plane crash, including the cause, are not clear. The exercises, called Clear Sky-2018, include members of the California's National Guard's Fresno-based 144th Fighter Wing group, according to a Facebook post.

USA servicemen stand in front of US F-15 fighter during an air force exercises on Starokostyantyniv military airbase in Ukraine, Oct. 12, 2018.

Training during the exercise was scheduled to include air sovereignty, air interdiction, air-to-ground integration, air-mobility operations, aeromedical evacuation, cyber defense and personnel recovery.

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